Double-acting force-pump



O. P. OLSON.. DOUBLE ACTING FORGE PUMP.

(No Model.)

l, l il .Z iinnnnnnnnnivvvvvx""Wm Patented Aug. 20

lINrrEn STATES PATENT GEEicE.

OLOE PETER` OLSON, OE OSHKOsH, WISCONSIN.

DOUBLE-ACTING FORCE-PUMP.

. SPECIFICATION forming part of Letters Patent No. 544,86 4, datedAugust 20, 1895.

Application filed February 2, 1895. Serial No. 537,095. i (No model.)

Y Oshkosh, in the county otWinnebago and 5 is held in place.

State of Wisconsin, have invented certain new and useful ImprovementsinfDouble- Acting Force-Pumps; and I do hereby declare that thefollowing is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanyingdrawings," which form a part of this specification.

My invention relates to double-actin g forcepumps; and its object is toprovide an improved construction of the same whereby l secure importantadvantages with respect to efficiency in operation. v

The invention consists in the novel construction and combination ofparts hereinafter fully described and claimed.

In the accompanying drawings,'Figure 1 is a central longitudinal sectionof a pump constructed in accordance with my invention. Fig. 2 is ahorizontal section on the line on Qc, Fig. 1. Fig. 3 is a horizontalsectional View of a modified construction.

In the said drawings, the reference-numeral l designates a cylinderadapted to be set in a well and provided with an upwardly-opening valve2. At its upper end this cylinder is screw-threaded internally toreceive the correspondingly-threaded end of a similar cylinder 3, thusforming a two-part cylinder. Near the lower end on its inner side Vthesaid cylinder 3 is formed with a series of inwardly'- extendingscrew-threaded lugs 4, with which engages the threaded end of a cylinder5, located within and concentric with the cylinder 3. By means of theselugs the cylinder The upper end of cylinder 3 is provided with ascrew-cap 6, with which is connected a discharge-pipe 7. The

upper end of cylinder 5is closed by a stuffingbox 8, having a gland 9,through which passes a piston or plunger rod lO. To the lower end ofthis rod is secured a piston 12, the lower end of which is provided witha nut 13. Between this nut and piston is clamped a leather or otherpacking 14:. Screwing into the nut 13 is a piston-rod 15, provided atitslower end with a piston 16, connected with the rod 15' bya screw-nut 17.This piston is provided with an upwardly-working valve 18, soconstructed that it will open on the downstroke of the piston andadmitwater to the cylinder 1 above the latter.

The numeral `19 designates an air-pipe passing through cylinders 3 and 5and communicating with the latter, so as to overcome the vacuum whichwould otherwise be formed in cylinder 5 on the downstroke of piston 12.

The operation isas follows: On the upstroke of the pistons water will bedrawn into the lower end of cylinder 1 through the valve in the lowerend of the same. 0n the downstroke of the pistons valve 18 will open,allowing the water `to enter cylinder 1 above the piston 16. On the nextupstroke of the pistons halt' ot' the-water in said cylinder 1 will beforced out between the lugs 4 rinto the water-space between cylinders 3and 5, while the other half of the water will enter thelower end ofcylinder 5. Upon theA next downstroke thiswater will be forcedby piston12 out into the water-space or away, and from thence into thedischarge-pipe. It will thus be seen that the pump is vdouble-acting,the water being alternately forced outward and upward between cylinders3 and 5 by means of the two pistons.

In the modification shown in Fig. 3 the pump is intended as a deep-wellpump, the cylinders 3 and 1 being disconnected from each other andclosed, respectively, by screwcaps 20 and 2]., connected together by apipe 23. In this case the cylinders 3 and 5 may be located just belowthe ground, while the cylinder 1 may be set at any depth desired.

The invention will be found especially applicable for use in connectionwith oil-wells, as the cylinders can be made very small, so as to titthe diameter of the well.

Having thus fully described my invention, what I claim is 1. In adouble-acting pump the combination with the lower cylinder and the uppercylinder removably connected therewith having screw-threaded lugs at itslower end, ot the cylinder located within and concentric with said uppercylinder, and screw-threaded at its lower end to engage with said lugs,the piston rod and piston "located and working in said inner cylinder,the pist-on rod connected IOO therewith, the piston secured theretohaving an upwardly opening valve and the valve in the lower end of thelower cylinder, substantially as described.

2. In a double acting pump, the combination with the lower cylinderprovided with an upwardly opening valve, and the upper lcylinderrearwardly connected therewith having screwthreaded lugs near its lowerend, of the cylinder located Within said upper cylinder with its lowerend engaging with said lugs, the air pipe extending through said upperinner and outer cylinders, the stuffing box at the upper end of saidcylinder, the piston rod, the piston connected therewith Working in saidinner cylinder, and the piston-rod connected with said piston, having anupwardly opening valve, and working within the lower cylinder,substantially as described.

In testimony that I claim the foregoing as my own I have hereuntoaffixed my signature in presence of two witnesses.

OLOF PETER OLSON.

Witnesses:

BERTHA EBERNAU, CHARLES I-I. FORWARD.

